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稻壳灰中二氧化硅材料的制备与表征â '——一种经济可行的方法

摘要

稻壳是一种农业生物质，提供了丰富的硅源。在印度，稻壳在农田中被广泛焚烧，因为很难找到其他用途。农民通常在不完全燃烧的情况下燃烧稻壳，以避免意外火灾。本研究以稻壳灰为原料，采用溶胶-凝胶法制备无定形二氧化硅。最初从稻壳灰中获得，分别在400°C、500°C、600°C和700°C下焙烧5小时，去除样品中的挥发物，测定SiO2的无定形结构。然后将热处理后的RHA与碱液混合得到水玻璃溶液，水玻璃溶液中和得到沉淀二氧化硅。浸泡在硝酸中的稻壳产生最大数量的硅酸钠溶液和沉淀二氧化硅。同时测定了水玻璃溶液中氧化钠(Na2O)含量和二氧化硅(SiO2)含量。用傅里叶红外(FTIR)、x射线衍射和光学显微镜技术对提取的二氧化硅颗粒进行了表征。用红外光谱、扫描电镜和EDX对二氧化硅的化学组成进行了确证。 Highly pure amorphous silica was derived from rice husk ash was confirmed by XRD pattern. The morphology of the obtained materials was analyzed by SEM. At optimized conditions, nano sized highly pure silica was produced with a high reactivity and 99.9% amorphous in form. This economic technology as applied to waste material also provides many benefits to the local agro industry. Thus this paper may be providing a low cost and simple method to prepare functional materials.

吉瑟·D，阿南德·A，拉梅什·PS

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